Ask HN: I want to open source a my SaaS project. What should I know?

My current side project is closed source, and I want to make it open as I believe it can benefit from some community love (also I'm not making money off it, so not much to lose!).

Besides the usual things like good documentation, purging secrets, easy dev/deployment process, what else should I know?

Also, its currently hosted on Gitlab, I like the CI/CD better. Is it worth switching to Github for the starzzz?

Background: Ive managed large OSS packages, but nothing SAAS-like.